/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 14:30:18,138 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 14:30:18,140 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 14:30:18,159 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 14:30:18,159 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 14:30:18,161 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 14:30:18,163 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 14:30:18,174 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 14:30:18,179 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 14:30:18,182 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 14:30:18,184 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 14:30:18,185 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 14:30:18,185 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 14:30:18,187 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 14:30:18,190 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 14:30:18,191 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 14:30:18,193 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 14:30:18,194 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 14:30:18,195 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 14:30:18,200 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 14:30:18,205 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 14:30:18,209 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 14:30:18,210 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 14:30:18,211 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 14:30:18,213 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 14:30:18,223 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 14:30:18,223 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 14:30:18,225 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 14:30:18,226 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 14:30:18,263 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 14:30:18,263 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 14:30:18,268 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 14:30:18,268 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 14:30:18,269 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 14:30:18,269 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 14:30:18,269 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 14:30:18,269 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 14:30:18,269 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 14:30:18,269 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 14:30:18,270 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 14:30:18,270 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 14:30:18,270 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 14:30:18,272 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 14:30:18,273 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 14:30:18,273 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 14:30:18,273 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 14:30:18,273 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 14:30:18,274 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 14:30:18,274 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 14:30:18,274 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 14:30:18,274 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:30:18,274 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 14:30:18,276 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 14:30:18,277 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 14:30:18,277 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 14:30:18,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:18,277 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 14:30:18,278 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 14:30:18,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 14:30:18,599 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 14:30:18,613 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 14:30:18,616 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 14:30:18,618 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 14:30:18,618 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 14:30:18,619 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-20 14:30:18,701 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61e3ee939/68422d85a2d9496d8d39563c33644c7a/FLAGee81eb8b0 [2020-07-20 14:30:19,171 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 14:30:19,172 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-20 14:30:19,178 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61e3ee939/68422d85a2d9496d8d39563c33644c7a/FLAGee81eb8b0 [2020-07-20 14:30:19,560 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/61e3ee939/68422d85a2d9496d8d39563c33644c7a [2020-07-20 14:30:19,572 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 14:30:19,576 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 14:30:19,577 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 14:30:19,577 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 14:30:19,583 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 14:30:19,584 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,587 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@703f0828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19, skipping insertion in model container [2020-07-20 14:30:19,587 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,595 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 14:30:19,616 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 14:30:19,789 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:30:19,794 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 14:30:19,812 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 14:30:19,826 INFO L208 MainTranslator]: Completed translation [2020-07-20 14:30:19,826 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19 WrapperNode [2020-07-20 14:30:19,826 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 14:30:19,827 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 14:30:19,827 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 14:30:19,827 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 14:30:19,837 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,837 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,923 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,924 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,928 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,938 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,939 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... [2020-07-20 14:30:19,941 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 14:30:19,941 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 14:30:19,942 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 14:30:19,942 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 14:30:19,943 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 14:30:20,016 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 14:30:20,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 14:30:20,017 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 14:30:20,017 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 14:30:20,017 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 14:30:20,017 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 14:30:20,017 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 14:30:20,018 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 14:30:20,018 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 14:30:20,018 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 14:30:20,018 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 14:30:20,018 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 14:30:20,018 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 14:30:20,269 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 14:30:20,270 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 14:30:20,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:30:20 BoogieIcfgContainer [2020-07-20 14:30:20,276 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 14:30:20,277 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 14:30:20,277 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 14:30:20,280 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 14:30:20,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 02:30:19" (1/3) ... [2020-07-20 14:30:20,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e2b35f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:30:20, skipping insertion in model container [2020-07-20 14:30:20,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 02:30:19" (2/3) ... [2020-07-20 14:30:20,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e2b35f6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 02:30:20, skipping insertion in model container [2020-07-20 14:30:20,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 02:30:20" (3/3) ... [2020-07-20 14:30:20,284 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-20 14:30:20,297 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 14:30:20,306 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 14:30:20,324 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 14:30:20,355 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 14:30:20,355 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 14:30:20,355 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 14:30:20,355 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 14:30:20,356 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 14:30:20,356 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 14:30:20,356 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 14:30:20,356 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 14:30:20,380 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-20 14:30:20,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 14:30:20,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:20,388 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:20,388 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:20,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:20,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-20 14:30:20,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:20,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [258681658] [2020-07-20 14:30:20,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:20,497 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 14:30:20,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:20,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 14:30:20,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:20,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:20,575 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:20,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [258681658] [2020-07-20 14:30:20,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:20,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 14:30:20,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475912023] [2020-07-20 14:30:20,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 14:30:20,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:20,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 14:30:20,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:30:20,597 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-20 14:30:20,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:20,683 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-20 14:30:20,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 14:30:20,684 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-20 14:30:20,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:20,693 INFO L225 Difference]: With dead ends: 53 [2020-07-20 14:30:20,693 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 14:30:20,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 14:30:20,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 14:30:20,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-20 14:30:20,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 14:30:20,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-20 14:30:20,742 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-20 14:30:20,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:20,743 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-20 14:30:20,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 14:30:20,743 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-20 14:30:20,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 14:30:20,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:20,745 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:20,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:20,961 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:20,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:20,962 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-20 14:30:20,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:20,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75958587] [2020-07-20 14:30:20,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,005 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:21,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:21,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:30:21,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:21,061 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:21,068 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:21,110 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 14:30:21,110 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:21,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75958587] [2020-07-20 14:30:21,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:21,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 14:30:21,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071449944] [2020-07-20 14:30:21,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 14:30:21,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:21,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 14:30:21,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 14:30:21,115 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-07-20 14:30:21,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:21,236 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2020-07-20 14:30:21,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 14:30:21,236 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-07-20 14:30:21,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:21,238 INFO L225 Difference]: With dead ends: 46 [2020-07-20 14:30:21,238 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 14:30:21,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:30:21,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 14:30:21,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-07-20 14:30:21,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 14:30:21,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-07-20 14:30:21,250 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 21 [2020-07-20 14:30:21,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:21,250 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-07-20 14:30:21,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 14:30:21,250 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-07-20 14:30:21,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 14:30:21,252 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:21,252 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:21,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,466 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:21,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:21,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-20 14:30:21,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:21,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52147665] [2020-07-20 14:30:21,467 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:21,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:21,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:21,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 14:30:21,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:21,661 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 14:30:21,661 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 14:30:21,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52147665] [2020-07-20 14:30:21,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 14:30:21,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 14:30:21,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190610050] [2020-07-20 14:30:21,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 14:30:21,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:21,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 14:30:21,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 14:30:21,671 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2020-07-20 14:30:21,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:21,856 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2020-07-20 14:30:21,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 14:30:21,856 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-07-20 14:30:21,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:21,861 INFO L225 Difference]: With dead ends: 68 [2020-07-20 14:30:21,861 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 14:30:21,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2020-07-20 14:30:21,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 14:30:21,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-07-20 14:30:21,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 14:30:21,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-07-20 14:30:21,878 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 28 [2020-07-20 14:30:21,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:21,879 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-07-20 14:30:21,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 14:30:21,879 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-07-20 14:30:21,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 14:30:21,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:21,882 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:22,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,093 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:22,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:22,095 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 1 times [2020-07-20 14:30:22,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:22,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125353646] [2020-07-20 14:30:22,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:22,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:22,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:22,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:30:22,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:22,223 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:22,225 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:22,251 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 14:30:22,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:22,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:22,372 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 14:30:22,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125353646] [2020-07-20 14:30:22,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:22,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-20 14:30:22,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510653279] [2020-07-20 14:30:22,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 14:30:22,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:22,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 14:30:22,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:30:22,375 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 16 states. [2020-07-20 14:30:22,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:22,850 INFO L93 Difference]: Finished difference Result 105 states and 129 transitions. [2020-07-20 14:30:22,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 14:30:22,851 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-07-20 14:30:22,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:22,854 INFO L225 Difference]: With dead ends: 105 [2020-07-20 14:30:22,854 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 14:30:22,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=249, Invalid=563, Unknown=0, NotChecked=0, Total=812 [2020-07-20 14:30:22,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 14:30:22,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 55. [2020-07-20 14:30:22,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 14:30:22,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2020-07-20 14:30:22,872 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 41 [2020-07-20 14:30:22,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:22,873 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2020-07-20 14:30:22,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 14:30:22,873 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2020-07-20 14:30:22,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 14:30:22,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:22,876 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:23,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:23,091 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:23,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:23,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 2 times [2020-07-20 14:30:23,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:23,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173902264] [2020-07-20 14:30:23,093 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:23,175 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:23,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:23,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:30:23,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:23,332 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 63 proven. 16 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-20 14:30:23,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:23,497 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 17 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-20 14:30:23,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173902264] [2020-07-20 14:30:23,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:23,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-20 14:30:23,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579164226] [2020-07-20 14:30:23,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 14:30:23,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:23,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 14:30:23,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-07-20 14:30:23,504 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 15 states. [2020-07-20 14:30:24,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:24,108 INFO L93 Difference]: Finished difference Result 131 states and 165 transitions. [2020-07-20 14:30:24,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 14:30:24,109 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 62 [2020-07-20 14:30:24,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:24,112 INFO L225 Difference]: With dead ends: 131 [2020-07-20 14:30:24,113 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 14:30:24,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2020-07-20 14:30:24,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 14:30:24,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 65. [2020-07-20 14:30:24,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 14:30:24,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2020-07-20 14:30:24,149 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 62 [2020-07-20 14:30:24,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:24,153 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2020-07-20 14:30:24,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 14:30:24,155 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2020-07-20 14:30:24,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-20 14:30:24,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:24,157 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:24,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:24,373 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:24,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:24,373 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 3 times [2020-07-20 14:30:24,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:24,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018820371] [2020-07-20 14:30:24,375 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:24,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:24,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:24,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:30:24,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:24,593 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 78 proven. 59 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-20 14:30:24,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:24,776 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 55 proven. 60 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-20 14:30:24,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018820371] [2020-07-20 14:30:24,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:24,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-20 14:30:24,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000058351] [2020-07-20 14:30:24,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 14:30:24,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:24,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 14:30:24,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2020-07-20 14:30:24,779 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand 19 states. [2020-07-20 14:30:25,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:25,613 INFO L93 Difference]: Finished difference Result 139 states and 173 transitions. [2020-07-20 14:30:25,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 14:30:25,614 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 79 [2020-07-20 14:30:25,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:25,616 INFO L225 Difference]: With dead ends: 139 [2020-07-20 14:30:25,616 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 14:30:25,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=353, Invalid=1053, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:30:25,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 14:30:25,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 79. [2020-07-20 14:30:25,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 14:30:25,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2020-07-20 14:30:25,654 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 79 [2020-07-20 14:30:25,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:25,657 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2020-07-20 14:30:25,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 14:30:25,657 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2020-07-20 14:30:25,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-20 14:30:25,663 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:25,663 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:25,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:25,879 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:25,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:25,880 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 4 times [2020-07-20 14:30:25,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:25,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783041170] [2020-07-20 14:30:25,881 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:25,921 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:25,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:25,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:30:25,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:26,026 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 215 proven. 33 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 14:30:26,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:26,162 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 131 proven. 45 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 14:30:26,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783041170] [2020-07-20 14:30:26,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:26,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-20 14:30:26,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129969755] [2020-07-20 14:30:26,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 14:30:26,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:26,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 14:30:26,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-07-20 14:30:26,165 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand 16 states. [2020-07-20 14:30:26,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:26,531 INFO L93 Difference]: Finished difference Result 163 states and 204 transitions. [2020-07-20 14:30:26,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 14:30:26,531 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 99 [2020-07-20 14:30:26,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:26,533 INFO L225 Difference]: With dead ends: 163 [2020-07-20 14:30:26,534 INFO L226 Difference]: Without dead ends: 96 [2020-07-20 14:30:26,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=203, Invalid=447, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:30:26,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-20 14:30:26,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-20 14:30:26,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 14:30:26,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 102 transitions. [2020-07-20 14:30:26,568 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 102 transitions. Word has length 99 [2020-07-20 14:30:26,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:26,569 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 102 transitions. [2020-07-20 14:30:26,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 14:30:26,569 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 102 transitions. [2020-07-20 14:30:26,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 14:30:26,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:26,579 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:26,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:26,793 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:26,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:26,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 5 times [2020-07-20 14:30:26,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:26,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1178357058] [2020-07-20 14:30:26,794 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:26,847 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:26,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:26,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:30:26,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:26,991 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 110 proven. 120 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-20 14:30:26,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:27,162 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 75 proven. 121 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-20 14:30:27,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1178357058] [2020-07-20 14:30:27,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:27,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-20 14:30:27,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673725652] [2020-07-20 14:30:27,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 14:30:27,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:27,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 14:30:27,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:30:27,165 INFO L87 Difference]: Start difference. First operand 86 states and 102 transitions. Second operand 18 states. [2020-07-20 14:30:28,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:28,169 INFO L93 Difference]: Finished difference Result 168 states and 210 transitions. [2020-07-20 14:30:28,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 14:30:28,170 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2020-07-20 14:30:28,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:28,172 INFO L225 Difference]: With dead ends: 168 [2020-07-20 14:30:28,172 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 14:30:28,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 191 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=472, Invalid=1508, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 14:30:28,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 14:30:28,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 99. [2020-07-20 14:30:28,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-20 14:30:28,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 119 transitions. [2020-07-20 14:30:28,192 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 119 transitions. Word has length 106 [2020-07-20 14:30:28,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:28,193 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 119 transitions. [2020-07-20 14:30:28,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 14:30:28,193 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 119 transitions. [2020-07-20 14:30:28,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-20 14:30:28,194 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:28,194 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:28,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:28,404 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:28,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:28,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 6 times [2020-07-20 14:30:28,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:28,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557996926] [2020-07-20 14:30:28,407 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:28,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:28,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:28,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 14:30:28,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:28,589 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 334 proven. 60 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-20 14:30:28,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:28,765 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 214 proven. 60 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-20 14:30:28,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557996926] [2020-07-20 14:30:28,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:28,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-20 14:30:28,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286555263] [2020-07-20 14:30:28,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 14:30:28,767 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:28,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 14:30:28,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-07-20 14:30:28,768 INFO L87 Difference]: Start difference. First operand 99 states and 119 transitions. Second operand 15 states. [2020-07-20 14:30:29,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:29,221 INFO L93 Difference]: Finished difference Result 186 states and 227 transitions. [2020-07-20 14:30:29,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 14:30:29,222 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 123 [2020-07-20 14:30:29,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:29,224 INFO L225 Difference]: With dead ends: 186 [2020-07-20 14:30:29,224 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 14:30:29,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 232 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=240, Invalid=516, Unknown=0, NotChecked=0, Total=756 [2020-07-20 14:30:29,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 14:30:29,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-20 14:30:29,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 14:30:29,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2020-07-20 14:30:29,241 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 123 [2020-07-20 14:30:29,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:29,241 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2020-07-20 14:30:29,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 14:30:29,242 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2020-07-20 14:30:29,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-20 14:30:29,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:29,244 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:29,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:29,458 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:29,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:29,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 7 times [2020-07-20 14:30:29,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:29,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586863816] [2020-07-20 14:30:29,459 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:29,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:29,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:29,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:30:29,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:29,706 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 65 proven. 267 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-20 14:30:29,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:29,922 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 64 proven. 268 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-20 14:30:29,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586863816] [2020-07-20 14:30:29,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:29,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-20 14:30:29,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808239217] [2020-07-20 14:30:29,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 14:30:29,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:29,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 14:30:29,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:30:29,925 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand 22 states. [2020-07-20 14:30:31,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:31,433 INFO L93 Difference]: Finished difference Result 184 states and 228 transitions. [2020-07-20 14:30:31,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-20 14:30:31,434 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 130 [2020-07-20 14:30:31,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:31,436 INFO L225 Difference]: With dead ends: 184 [2020-07-20 14:30:31,436 INFO L226 Difference]: Without dead ends: 141 [2020-07-20 14:30:31,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 235 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=721, Invalid=2359, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 14:30:31,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-07-20 14:30:31,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 107. [2020-07-20 14:30:31,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 14:30:31,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 127 transitions. [2020-07-20 14:30:31,453 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 127 transitions. Word has length 130 [2020-07-20 14:30:31,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:31,454 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 127 transitions. [2020-07-20 14:30:31,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 14:30:31,454 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 127 transitions. [2020-07-20 14:30:31,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-20 14:30:31,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:31,456 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:31,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:31,657 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:31,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:31,658 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 8 times [2020-07-20 14:30:31,658 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:31,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [245216247] [2020-07-20 14:30:31,659 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:31,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:31,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:31,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:30:31,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:31,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 551 proven. 122 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-20 14:30:31,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:32,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 288 proven. 201 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-20 14:30:32,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [245216247] [2020-07-20 14:30:32,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:32,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-20 14:30:32,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987887713] [2020-07-20 14:30:32,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 14:30:32,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:32,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 14:30:32,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2020-07-20 14:30:32,053 INFO L87 Difference]: Start difference. First operand 107 states and 127 transitions. Second operand 19 states. [2020-07-20 14:30:32,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:32,926 INFO L93 Difference]: Finished difference Result 206 states and 253 transitions. [2020-07-20 14:30:32,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 14:30:32,926 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 154 [2020-07-20 14:30:32,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:32,929 INFO L225 Difference]: With dead ends: 206 [2020-07-20 14:30:32,929 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 14:30:32,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 290 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=537, Invalid=1185, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 14:30:32,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 14:30:32,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-20 14:30:32,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-20 14:30:32,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 138 transitions. [2020-07-20 14:30:32,948 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 138 transitions. Word has length 154 [2020-07-20 14:30:32,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:32,949 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 138 transitions. [2020-07-20 14:30:32,949 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 14:30:32,949 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 138 transitions. [2020-07-20 14:30:32,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-20 14:30:32,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:32,951 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:33,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:33,166 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:33,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:33,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 9 times [2020-07-20 14:30:33,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:33,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [597693868] [2020-07-20 14:30:33,168 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:33,229 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:33,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:33,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:30:33,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:33,387 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:33,388 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:30:33,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 469 proven. 33 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-20 14:30:33,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:33,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:30:33,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 83 proven. 419 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-20 14:30:33,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [597693868] [2020-07-20 14:30:33,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:33,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-20 14:30:33,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685664820] [2020-07-20 14:30:33,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 14:30:33,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:33,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 14:30:33,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=355, Unknown=0, NotChecked=0, Total=506 [2020-07-20 14:30:33,721 INFO L87 Difference]: Start difference. First operand 117 states and 138 transitions. Second operand 23 states. [2020-07-20 14:30:34,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:34,583 INFO L93 Difference]: Finished difference Result 165 states and 201 transitions. [2020-07-20 14:30:34,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 14:30:34,584 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 161 [2020-07-20 14:30:34,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:34,587 INFO L225 Difference]: With dead ends: 165 [2020-07-20 14:30:34,587 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 14:30:34,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 307 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=725, Invalid=1627, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 14:30:34,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 14:30:34,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 136. [2020-07-20 14:30:34,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-20 14:30:34,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 166 transitions. [2020-07-20 14:30:34,609 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 166 transitions. Word has length 161 [2020-07-20 14:30:34,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:34,610 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 166 transitions. [2020-07-20 14:30:34,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 14:30:34,610 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 166 transitions. [2020-07-20 14:30:34,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-20 14:30:34,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:34,613 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:34,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:34,828 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:34,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:34,829 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 10 times [2020-07-20 14:30:34,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:34,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661674137] [2020-07-20 14:30:34,830 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:34,902 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:34,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:34,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:30:34,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:35,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 621 proven. 517 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-20 14:30:35,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:35,439 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 340 proven. 518 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-20 14:30:35,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661674137] [2020-07-20 14:30:35,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:35,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-20 14:30:35,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200011168] [2020-07-20 14:30:35,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 14:30:35,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:35,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 14:30:35,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:30:35,442 INFO L87 Difference]: Start difference. First operand 136 states and 166 transitions. Second operand 26 states. [2020-07-20 14:30:37,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:37,445 INFO L93 Difference]: Finished difference Result 278 states and 359 transitions. [2020-07-20 14:30:37,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-20 14:30:37,446 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 196 [2020-07-20 14:30:37,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:37,448 INFO L225 Difference]: With dead ends: 278 [2020-07-20 14:30:37,448 INFO L226 Difference]: Without dead ends: 206 [2020-07-20 14:30:37,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 363 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1034, Invalid=3256, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 14:30:37,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-20 14:30:37,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 156. [2020-07-20 14:30:37,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-20 14:30:37,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 194 transitions. [2020-07-20 14:30:37,477 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 194 transitions. Word has length 196 [2020-07-20 14:30:37,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:37,478 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 194 transitions. [2020-07-20 14:30:37,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 14:30:37,478 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 194 transitions. [2020-07-20 14:30:37,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-20 14:30:37,480 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:37,480 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:37,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:37,695 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:37,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:37,696 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 11 times [2020-07-20 14:30:37,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:37,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70616498] [2020-07-20 14:30:37,697 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:37,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:37,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:37,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:30:37,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:37,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1508 proven. 220 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-20 14:30:37,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:38,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 735 proven. 399 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-20 14:30:38,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70616498] [2020-07-20 14:30:38,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:38,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-20 14:30:38,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750319084] [2020-07-20 14:30:38,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 14:30:38,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:38,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 14:30:38,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2020-07-20 14:30:38,282 INFO L87 Difference]: Start difference. First operand 156 states and 194 transitions. Second operand 23 states. [2020-07-20 14:30:39,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:39,338 INFO L93 Difference]: Finished difference Result 289 states and 381 transitions. [2020-07-20 14:30:39,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 14:30:39,339 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 230 [2020-07-20 14:30:39,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:39,342 INFO L225 Difference]: With dead ends: 289 [2020-07-20 14:30:39,342 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 14:30:39,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 438 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=658, Invalid=1598, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 14:30:39,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 14:30:39,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-20 14:30:39,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 14:30:39,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 245 transitions. [2020-07-20 14:30:39,371 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 245 transitions. Word has length 230 [2020-07-20 14:30:39,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:39,372 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 245 transitions. [2020-07-20 14:30:39,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 14:30:39,372 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 245 transitions. [2020-07-20 14:30:39,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 14:30:39,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:39,375 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:39,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:39,590 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:39,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:39,591 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 12 times [2020-07-20 14:30:39,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:39,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857621589] [2020-07-20 14:30:39,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:39,671 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:39,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:39,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 435 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:30:39,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:39,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 898 proven. 634 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-20 14:30:39,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:40,137 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 467 proven. 635 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-20 14:30:40,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857621589] [2020-07-20 14:30:40,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:40,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-20 14:30:40,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071611649] [2020-07-20 14:30:40,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 14:30:40,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:40,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 14:30:40,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2020-07-20 14:30:40,140 INFO L87 Difference]: Start difference. First operand 190 states and 245 transitions. Second operand 21 states. [2020-07-20 14:30:41,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:41,689 INFO L93 Difference]: Finished difference Result 447 states and 593 transitions. [2020-07-20 14:30:41,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 14:30:41,690 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 237 [2020-07-20 14:30:41,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:41,694 INFO L225 Difference]: With dead ends: 447 [2020-07-20 14:30:41,695 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 14:30:41,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 449 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1151 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=850, Invalid=2932, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 14:30:41,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 14:30:41,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 254. [2020-07-20 14:30:41,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 14:30:41,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 328 transitions. [2020-07-20 14:30:41,739 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 328 transitions. Word has length 237 [2020-07-20 14:30:41,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:41,740 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 328 transitions. [2020-07-20 14:30:41,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 14:30:41,740 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 328 transitions. [2020-07-20 14:30:41,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-20 14:30:41,743 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:41,743 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:41,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:41,959 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:41,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:41,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 13 times [2020-07-20 14:30:41,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:41,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505414407] [2020-07-20 14:30:41,961 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:42,029 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:42,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:42,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 14:30:42,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:42,224 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1861 proven. 224 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-20 14:30:42,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:42,465 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1123 proven. 224 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-20 14:30:42,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505414407] [2020-07-20 14:30:42,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:42,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-20 14:30:42,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981868049] [2020-07-20 14:30:42,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 14:30:42,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:42,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 14:30:42,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2020-07-20 14:30:42,468 INFO L87 Difference]: Start difference. First operand 254 states and 328 transitions. Second operand 18 states. [2020-07-20 14:30:43,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:43,206 INFO L93 Difference]: Finished difference Result 363 states and 475 transitions. [2020-07-20 14:30:43,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 14:30:43,206 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 261 [2020-07-20 14:30:43,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:43,209 INFO L225 Difference]: With dead ends: 363 [2020-07-20 14:30:43,209 INFO L226 Difference]: Without dead ends: 206 [2020-07-20 14:30:43,211 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 505 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=429, Invalid=977, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:30:43,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-20 14:30:43,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-20 14:30:43,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 14:30:43,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 263 transitions. [2020-07-20 14:30:43,246 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 263 transitions. Word has length 261 [2020-07-20 14:30:43,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:43,246 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 263 transitions. [2020-07-20 14:30:43,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 14:30:43,247 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 263 transitions. [2020-07-20 14:30:43,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-20 14:30:43,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:43,249 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:43,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:43,465 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:43,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:43,465 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 14 times [2020-07-20 14:30:43,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:43,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283084106] [2020-07-20 14:30:43,466 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:43,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:43,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:43,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:30:43,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:43,875 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 909 proven. 1045 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-20 14:30:43,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:44,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 484 proven. 1046 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-20 14:30:44,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283084106] [2020-07-20 14:30:44,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:44,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-20 14:30:44,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742224641] [2020-07-20 14:30:44,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 14:30:44,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:44,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 14:30:44,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2020-07-20 14:30:44,201 INFO L87 Difference]: Start difference. First operand 206 states and 263 transitions. Second operand 25 states. [2020-07-20 14:30:46,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:46,924 INFO L93 Difference]: Finished difference Result 364 states and 481 transitions. [2020-07-20 14:30:46,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-20 14:30:46,925 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 268 [2020-07-20 14:30:46,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:46,927 INFO L225 Difference]: With dead ends: 364 [2020-07-20 14:30:46,927 INFO L226 Difference]: Without dead ends: 258 [2020-07-20 14:30:46,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 507 SyntacticMatches, 5 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1434, Invalid=5046, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 14:30:46,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-20 14:30:46,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 224. [2020-07-20 14:30:46,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 14:30:46,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 287 transitions. [2020-07-20 14:30:46,988 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 287 transitions. Word has length 268 [2020-07-20 14:30:46,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:46,989 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 287 transitions. [2020-07-20 14:30:46,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 14:30:46,989 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 287 transitions. [2020-07-20 14:30:46,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 14:30:46,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:46,993 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:47,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:47,207 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:47,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:47,207 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 15 times [2020-07-20 14:30:47,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:47,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771140506] [2020-07-20 14:30:47,208 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:47,283 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:47,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:47,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:30:47,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:47,553 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2489 proven. 351 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-20 14:30:47,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:47,904 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1293 proven. 629 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-20 14:30:47,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771140506] [2020-07-20 14:30:47,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:47,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-20 14:30:47,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387267338] [2020-07-20 14:30:47,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 14:30:47,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:47,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 14:30:47,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2020-07-20 14:30:47,906 INFO L87 Difference]: Start difference. First operand 224 states and 287 transitions. Second operand 22 states. [2020-07-20 14:30:49,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:49,183 INFO L93 Difference]: Finished difference Result 320 states and 417 transitions. [2020-07-20 14:30:49,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-20 14:30:49,188 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 299 [2020-07-20 14:30:49,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:49,190 INFO L225 Difference]: With dead ends: 320 [2020-07-20 14:30:49,190 INFO L226 Difference]: Without dead ends: 224 [2020-07-20 14:30:49,192 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 577 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=837, Invalid=2025, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 14:30:49,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-20 14:30:49,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-20 14:30:49,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-20 14:30:49,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 238 transitions. [2020-07-20 14:30:49,231 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 238 transitions. Word has length 299 [2020-07-20 14:30:49,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:49,232 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 238 transitions. [2020-07-20 14:30:49,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 14:30:49,232 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 238 transitions. [2020-07-20 14:30:49,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-20 14:30:49,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:49,237 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:49,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:49,451 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:49,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:49,452 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 16 times [2020-07-20 14:30:49,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:49,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1100259953] [2020-07-20 14:30:49,453 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:49,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:49,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:49,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:30:49,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:49,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 875 proven. 1633 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-20 14:30:49,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:50,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 484 proven. 1634 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-20 14:30:50,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1100259953] [2020-07-20 14:30:50,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:50,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-20 14:30:50,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502431228] [2020-07-20 14:30:50,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 14:30:50,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:50,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 14:30:50,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=658, Unknown=0, NotChecked=0, Total=812 [2020-07-20 14:30:50,353 INFO L87 Difference]: Start difference. First operand 193 states and 238 transitions. Second operand 29 states. [2020-07-20 14:30:53,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:53,900 INFO L93 Difference]: Finished difference Result 343 states and 444 transitions. [2020-07-20 14:30:53,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-07-20 14:30:53,901 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 306 [2020-07-20 14:30:53,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:53,903 INFO L225 Difference]: With dead ends: 343 [2020-07-20 14:30:53,903 INFO L226 Difference]: Without dead ends: 265 [2020-07-20 14:30:53,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 579 SyntacticMatches, 5 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1903, Invalid=6653, Unknown=0, NotChecked=0, Total=8556 [2020-07-20 14:30:53,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-20 14:30:53,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 214. [2020-07-20 14:30:53,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-20 14:30:53,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 266 transitions. [2020-07-20 14:30:53,952 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 266 transitions. Word has length 306 [2020-07-20 14:30:53,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:53,952 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 266 transitions. [2020-07-20 14:30:53,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 14:30:53,952 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 266 transitions. [2020-07-20 14:30:53,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-20 14:30:53,955 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:53,955 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:54,155 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:54,156 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:54,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:54,157 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 17 times [2020-07-20 14:30:54,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:54,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414277755] [2020-07-20 14:30:54,158 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:54,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:30:54,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:54,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:30:54,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:54,662 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3316 proven. 523 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-20 14:30:54,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:55,317 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1566 proven. 1139 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-20 14:30:55,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414277755] [2020-07-20 14:30:55,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:55,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-20 14:30:55,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497680541] [2020-07-20 14:30:55,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 14:30:55,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:55,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 14:30:55,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-07-20 14:30:55,322 INFO L87 Difference]: Start difference. First operand 214 states and 266 transitions. Second operand 26 states. [2020-07-20 14:30:57,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:30:57,395 INFO L93 Difference]: Finished difference Result 416 states and 539 transitions. [2020-07-20 14:30:57,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 14:30:57,396 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 344 [2020-07-20 14:30:57,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:30:57,398 INFO L225 Difference]: With dead ends: 416 [2020-07-20 14:30:57,399 INFO L226 Difference]: Without dead ends: 262 [2020-07-20 14:30:57,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 663 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1502, Invalid=3610, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 14:30:57,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-20 14:30:57,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-20 14:30:57,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 14:30:57,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 315 transitions. [2020-07-20 14:30:57,445 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 315 transitions. Word has length 344 [2020-07-20 14:30:57,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:30:57,446 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 315 transitions. [2020-07-20 14:30:57,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 14:30:57,446 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 315 transitions. [2020-07-20 14:30:57,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 14:30:57,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:30:57,449 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:30:57,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:57,664 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:30:57,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:30:57,664 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 18 times [2020-07-20 14:30:57,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:30:57,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107365577] [2020-07-20 14:30:57,664 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:30:57,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:30:57,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:30:57,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:30:57,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:30:58,209 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 775 proven. 2452 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-20 14:30:58,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:30:58,801 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 458 proven. 2453 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-20 14:30:58,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107365577] [2020-07-20 14:30:58,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:30:58,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-20 14:30:58,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43460072] [2020-07-20 14:30:58,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 14:30:58,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:30:58,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 14:30:58,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=861, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 14:30:58,803 INFO L87 Difference]: Start difference. First operand 248 states and 315 transitions. Second operand 33 states. [2020-07-20 14:31:03,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:03,366 INFO L93 Difference]: Finished difference Result 453 states and 590 transitions. [2020-07-20 14:31:03,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-20 14:31:03,366 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 351 [2020-07-20 14:31:03,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:03,373 INFO L225 Difference]: With dead ends: 453 [2020-07-20 14:31:03,374 INFO L226 Difference]: Without dead ends: 331 [2020-07-20 14:31:03,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 665 SyntacticMatches, 5 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3651 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2557, Invalid=8785, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 14:31:03,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-20 14:31:03,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 274. [2020-07-20 14:31:03,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-20 14:31:03,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 351 transitions. [2020-07-20 14:31:03,428 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 351 transitions. Word has length 351 [2020-07-20 14:31:03,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:03,429 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 351 transitions. [2020-07-20 14:31:03,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 14:31:03,429 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 351 transitions. [2020-07-20 14:31:03,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-20 14:31:03,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:03,432 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:03,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:03,648 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:03,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:03,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 19 times [2020-07-20 14:31:03,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:03,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1455522378] [2020-07-20 14:31:03,650 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:03,747 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:31:03,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:03,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:31:03,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:04,167 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4410 proven. 749 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-20 14:31:04,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:04,758 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2010 proven. 1763 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-20 14:31:04,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1455522378] [2020-07-20 14:31:04,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:04,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 30 [2020-07-20 14:31:04,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981953361] [2020-07-20 14:31:04,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 14:31:04,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:04,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 14:31:04,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2020-07-20 14:31:04,761 INFO L87 Difference]: Start difference. First operand 274 states and 351 transitions. Second operand 30 states. [2020-07-20 14:31:07,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:07,104 INFO L93 Difference]: Finished difference Result 444 states and 588 transitions. [2020-07-20 14:31:07,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 14:31:07,107 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 399 [2020-07-20 14:31:07,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:07,110 INFO L225 Difference]: With dead ends: 444 [2020-07-20 14:31:07,110 INFO L226 Difference]: Without dead ends: 321 [2020-07-20 14:31:07,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 769 SyntacticMatches, 4 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1660, Invalid=4192, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 14:31:07,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-20 14:31:07,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-20 14:31:07,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-20 14:31:07,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 400 transitions. [2020-07-20 14:31:07,187 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 400 transitions. Word has length 399 [2020-07-20 14:31:07,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:07,188 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 400 transitions. [2020-07-20 14:31:07,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 14:31:07,188 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 400 transitions. [2020-07-20 14:31:07,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-20 14:31:07,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:07,192 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:07,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:07,399 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:07,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:07,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 20 times [2020-07-20 14:31:07,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:07,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125449186] [2020-07-20 14:31:07,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:07,526 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:07,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:07,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:31:07,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:07,839 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1480 proven. 2573 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-20 14:31:07,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:08,318 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 767 proven. 2574 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-20 14:31:08,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125449186] [2020-07-20 14:31:08,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:08,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-20 14:31:08,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620417767] [2020-07-20 14:31:08,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 14:31:08,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:08,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 14:31:08,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:31:08,320 INFO L87 Difference]: Start difference. First operand 308 states and 400 transitions. Second operand 24 states. [2020-07-20 14:31:10,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:10,783 INFO L93 Difference]: Finished difference Result 708 states and 943 transitions. [2020-07-20 14:31:10,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 14:31:10,784 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 406 [2020-07-20 14:31:10,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:10,787 INFO L225 Difference]: With dead ends: 708 [2020-07-20 14:31:10,787 INFO L226 Difference]: Without dead ends: 575 [2020-07-20 14:31:10,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 783 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2182 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1394, Invalid=5086, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 14:31:10,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2020-07-20 14:31:10,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 408. [2020-07-20 14:31:10,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-20 14:31:10,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 530 transitions. [2020-07-20 14:31:10,877 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 530 transitions. Word has length 406 [2020-07-20 14:31:10,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:10,877 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 530 transitions. [2020-07-20 14:31:10,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 14:31:10,877 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 530 transitions. [2020-07-20 14:31:10,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-20 14:31:10,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:10,883 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:11,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:11,098 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:11,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:11,098 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 21 times [2020-07-20 14:31:11,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:11,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544141044] [2020-07-20 14:31:11,099 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:11,210 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:31:11,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:11,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 14:31:11,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:11,511 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4950 proven. 605 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-20 14:31:11,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:12,070 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3384 proven. 605 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-20 14:31:12,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544141044] [2020-07-20 14:31:12,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:12,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-20 14:31:12,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518675600] [2020-07-20 14:31:12,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 14:31:12,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:12,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 14:31:12,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2020-07-20 14:31:12,076 INFO L87 Difference]: Start difference. First operand 408 states and 530 transitions. Second operand 21 states. [2020-07-20 14:31:13,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:13,411 INFO L93 Difference]: Finished difference Result 557 states and 733 transitions. [2020-07-20 14:31:13,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 14:31:13,412 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 437 [2020-07-20 14:31:13,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:13,418 INFO L225 Difference]: With dead ends: 557 [2020-07-20 14:31:13,418 INFO L226 Difference]: Without dead ends: 327 [2020-07-20 14:31:13,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 854 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=675, Invalid=1581, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 14:31:13,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-20 14:31:13,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-20 14:31:13,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-20 14:31:13,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 422 transitions. [2020-07-20 14:31:13,485 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 422 transitions. Word has length 437 [2020-07-20 14:31:13,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:13,485 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 422 transitions. [2020-07-20 14:31:13,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 14:31:13,486 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 422 transitions. [2020-07-20 14:31:13,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-20 14:31:13,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:13,490 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:13,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:13,705 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:13,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:13,705 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 22 times [2020-07-20 14:31:13,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:13,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745988630] [2020-07-20 14:31:13,706 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:13,842 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:13,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:13,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:31:13,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:14,258 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1317 proven. 3531 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-20 14:31:14,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:14,846 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 710 proven. 3532 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-20 14:31:14,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745988630] [2020-07-20 14:31:14,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:14,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-20 14:31:14,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611285887] [2020-07-20 14:31:14,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 14:31:14,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:14,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 14:31:14,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2020-07-20 14:31:14,848 INFO L87 Difference]: Start difference. First operand 327 states and 422 transitions. Second operand 28 states. [2020-07-20 14:31:19,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:19,370 INFO L93 Difference]: Finished difference Result 545 states and 722 transitions. [2020-07-20 14:31:19,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-20 14:31:19,371 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 444 [2020-07-20 14:31:19,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:19,373 INFO L225 Difference]: With dead ends: 545 [2020-07-20 14:31:19,373 INFO L226 Difference]: Without dead ends: 402 [2020-07-20 14:31:19,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 855 SyntacticMatches, 6 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4405 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2533, Invalid=9677, Unknown=0, NotChecked=0, Total=12210 [2020-07-20 14:31:19,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-20 14:31:19,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 348. [2020-07-20 14:31:19,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 14:31:19,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 450 transitions. [2020-07-20 14:31:19,448 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 450 transitions. Word has length 444 [2020-07-20 14:31:19,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:19,448 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 450 transitions. [2020-07-20 14:31:19,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 14:31:19,448 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 450 transitions. [2020-07-20 14:31:19,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 14:31:19,453 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:19,453 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:19,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:19,668 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:19,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:19,668 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 23 times [2020-07-20 14:31:19,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:19,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874230915] [2020-07-20 14:31:19,669 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:19,777 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:31:19,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:19,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:31:19,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:20,171 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6090 proven. 834 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-20 14:31:20,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:20,886 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3585 proven. 1557 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-20 14:31:20,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874230915] [2020-07-20 14:31:20,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:20,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-20 14:31:20,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779086770] [2020-07-20 14:31:20,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 14:31:20,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:20,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 14:31:20,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2020-07-20 14:31:20,889 INFO L87 Difference]: Start difference. First operand 348 states and 450 transitions. Second operand 25 states. [2020-07-20 14:31:22,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:22,855 INFO L93 Difference]: Finished difference Result 481 states and 632 transitions. [2020-07-20 14:31:22,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 14:31:22,856 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 482 [2020-07-20 14:31:22,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:22,858 INFO L225 Difference]: With dead ends: 481 [2020-07-20 14:31:22,858 INFO L226 Difference]: Without dead ends: 348 [2020-07-20 14:31:22,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 940 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1270, Invalid=3152, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 14:31:22,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-20 14:31:22,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-20 14:31:22,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 14:31:22,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 448 transitions. [2020-07-20 14:31:22,937 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 448 transitions. Word has length 482 [2020-07-20 14:31:22,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:22,937 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 448 transitions. [2020-07-20 14:31:22,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 14:31:22,938 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 448 transitions. [2020-07-20 14:31:22,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 14:31:22,942 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:22,942 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:23,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:23,154 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:23,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:23,155 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 24 times [2020-07-20 14:31:23,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:23,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083286004] [2020-07-20 14:31:23,156 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:23,322 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:23,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:23,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:31:23,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:23,864 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1088 proven. 4777 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-20 14:31:23,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:24,722 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 627 proven. 4778 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-20 14:31:24,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083286004] [2020-07-20 14:31:24,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:24,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-20 14:31:24,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715797618] [2020-07-20 14:31:24,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 14:31:24,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:24,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 14:31:24,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=805, Unknown=0, NotChecked=0, Total=992 [2020-07-20 14:31:24,725 INFO L87 Difference]: Start difference. First operand 348 states and 448 transitions. Second operand 32 states. [2020-07-20 14:31:31,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:31,320 INFO L93 Difference]: Finished difference Result 552 states and 727 transitions. [2020-07-20 14:31:31,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 14:31:31,324 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 489 [2020-07-20 14:31:31,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:31,328 INFO L225 Difference]: With dead ends: 552 [2020-07-20 14:31:31,328 INFO L226 Difference]: Without dead ends: 406 [2020-07-20 14:31:31,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1076 GetRequests, 941 SyntacticMatches, 6 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6262 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=3560, Invalid=13470, Unknown=0, NotChecked=0, Total=17030 [2020-07-20 14:31:31,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2020-07-20 14:31:31,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 372. [2020-07-20 14:31:31,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-20 14:31:31,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 480 transitions. [2020-07-20 14:31:31,426 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 480 transitions. Word has length 489 [2020-07-20 14:31:31,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:31,427 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 480 transitions. [2020-07-20 14:31:31,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 14:31:31,427 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 480 transitions. [2020-07-20 14:31:31,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-20 14:31:31,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:31,432 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:31,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:31,646 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:31,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:31,647 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 25 times [2020-07-20 14:31:31,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:31,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [989612000] [2020-07-20 14:31:31,647 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:31,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:31:31,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:31,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:31:31,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:32,274 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7531 proven. 1117 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-20 14:31:32,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:33,058 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3921 proven. 2693 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-20 14:31:33,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [989612000] [2020-07-20 14:31:33,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:33,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-20 14:31:33,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20165803] [2020-07-20 14:31:33,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 14:31:33,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:33,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 14:31:33,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2020-07-20 14:31:33,061 INFO L87 Difference]: Start difference. First operand 372 states and 480 transitions. Second operand 29 states. [2020-07-20 14:31:36,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:36,182 INFO L93 Difference]: Finished difference Result 505 states and 661 transitions. [2020-07-20 14:31:36,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 14:31:36,183 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 534 [2020-07-20 14:31:36,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:36,189 INFO L225 Difference]: With dead ends: 505 [2020-07-20 14:31:36,189 INFO L226 Difference]: Without dead ends: 372 [2020-07-20 14:31:36,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1130 GetRequests, 1040 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2104, Invalid=5378, Unknown=0, NotChecked=0, Total=7482 [2020-07-20 14:31:36,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-20 14:31:36,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-20 14:31:36,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-20 14:31:36,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 433 transitions. [2020-07-20 14:31:36,261 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 433 transitions. Word has length 534 [2020-07-20 14:31:36,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:36,261 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 433 transitions. [2020-07-20 14:31:36,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 14:31:36,261 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 433 transitions. [2020-07-20 14:31:36,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-20 14:31:36,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:36,266 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:36,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:36,480 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:36,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:36,480 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 26 times [2020-07-20 14:31:36,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:36,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512523439] [2020-07-20 14:31:36,480 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:36,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:36,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:36,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 963 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:31:36,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:37,324 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 772 proven. 6374 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-20 14:31:37,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:38,278 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 509 proven. 6375 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-20 14:31:38,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512523439] [2020-07-20 14:31:38,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:38,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-20 14:31:38,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969364127] [2020-07-20 14:31:38,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 14:31:38,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:38,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 14:31:38,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1029, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 14:31:38,280 INFO L87 Difference]: Start difference. First operand 341 states and 433 transitions. Second operand 36 states. [2020-07-20 14:31:46,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:46,640 INFO L93 Difference]: Finished difference Result 520 states and 674 transitions. [2020-07-20 14:31:46,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-20 14:31:46,641 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 541 [2020-07-20 14:31:46,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:46,643 INFO L225 Difference]: With dead ends: 520 [2020-07-20 14:31:46,643 INFO L226 Difference]: Without dead ends: 402 [2020-07-20 14:31:46,645 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 1041 SyntacticMatches, 6 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7485 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=4201, Invalid=16391, Unknown=0, NotChecked=0, Total=20592 [2020-07-20 14:31:46,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-20 14:31:46,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 368. [2020-07-20 14:31:46,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 14:31:46,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 469 transitions. [2020-07-20 14:31:46,718 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 469 transitions. Word has length 541 [2020-07-20 14:31:46,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:46,719 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 469 transitions. [2020-07-20 14:31:46,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 14:31:46,719 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 469 transitions. [2020-07-20 14:31:46,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-20 14:31:46,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:46,726 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:46,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:46,940 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:46,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:46,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 27 times [2020-07-20 14:31:46,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:46,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104656711] [2020-07-20 14:31:46,940 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:47,070 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:31:47,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:47,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:31:47,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:47,737 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9327 proven. 1463 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-20 14:31:47,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:48,769 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4446 proven. 4022 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-20 14:31:48,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104656711] [2020-07-20 14:31:48,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:48,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-20 14:31:48,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649690528] [2020-07-20 14:31:48,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 14:31:48,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:48,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 14:31:48,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=823, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 14:31:48,771 INFO L87 Difference]: Start difference. First operand 368 states and 469 transitions. Second operand 33 states. [2020-07-20 14:31:53,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:31:53,242 INFO L93 Difference]: Finished difference Result 649 states and 846 transitions. [2020-07-20 14:31:53,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 14:31:53,243 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 593 [2020-07-20 14:31:53,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:31:53,246 INFO L225 Difference]: With dead ends: 649 [2020-07-20 14:31:53,246 INFO L226 Difference]: Without dead ends: 410 [2020-07-20 14:31:53,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1265 GetRequests, 1154 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2783 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3271, Invalid=8285, Unknown=0, NotChecked=0, Total=11556 [2020-07-20 14:31:53,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-20 14:31:53,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-20 14:31:53,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-20 14:31:53,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 516 transitions. [2020-07-20 14:31:53,312 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 516 transitions. Word has length 593 [2020-07-20 14:31:53,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:31:53,312 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 516 transitions. [2020-07-20 14:31:53,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 14:31:53,312 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 516 transitions. [2020-07-20 14:31:53,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-20 14:31:53,317 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:31:53,318 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:31:53,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:53,531 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:31:53,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:31:53,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 28 times [2020-07-20 14:31:53,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:31:53,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790599976] [2020-07-20 14:31:53,532 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:31:53,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:31:53,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:31:53,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 1065 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:31:53,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:31:54,534 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 348 proven. 8394 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-20 14:31:54,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:31:55,699 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 347 proven. 8395 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-20 14:31:55,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790599976] [2020-07-20 14:31:55,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:31:55,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-20 14:31:55,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838962001] [2020-07-20 14:31:55,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 14:31:55,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:31:55,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 14:31:55,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1279, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 14:31:55,701 INFO L87 Difference]: Start difference. First operand 402 states and 516 transitions. Second operand 40 states. [2020-07-20 14:32:05,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:05,852 INFO L93 Difference]: Finished difference Result 702 states and 919 transitions. [2020-07-20 14:32:05,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-20 14:32:05,854 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 600 [2020-07-20 14:32:05,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:05,857 INFO L225 Difference]: With dead ends: 702 [2020-07-20 14:32:05,857 INFO L226 Difference]: Without dead ends: 527 [2020-07-20 14:32:05,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1322 GetRequests, 1155 SyntacticMatches, 6 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9714 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=5642, Invalid=20764, Unknown=0, NotChecked=0, Total=26406 [2020-07-20 14:32:05,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2020-07-20 14:32:05,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 434. [2020-07-20 14:32:05,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-20 14:32:05,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 560 transitions. [2020-07-20 14:32:05,976 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 560 transitions. Word has length 600 [2020-07-20 14:32:05,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:05,977 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 560 transitions. [2020-07-20 14:32:05,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 14:32:05,977 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 560 transitions. [2020-07-20 14:32:05,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-20 14:32:05,986 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:05,986 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:06,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:06,201 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:06,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:06,201 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 29 times [2020-07-20 14:32:06,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:06,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096676276] [2020-07-20 14:32:06,202 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:06,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:32:06,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:06,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 760 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:32:06,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:07,938 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11572 proven. 1881 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-20 14:32:07,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:09,281 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5254 proven. 5553 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-20 14:32:09,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096676276] [2020-07-20 14:32:09,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:09,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 37 [2020-07-20 14:32:09,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049959856] [2020-07-20 14:32:09,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 14:32:09,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:09,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 14:32:09,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1044, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 14:32:09,284 INFO L87 Difference]: Start difference. First operand 434 states and 560 transitions. Second operand 37 states. [2020-07-20 14:32:14,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:14,938 INFO L93 Difference]: Finished difference Result 642 states and 845 transitions. [2020-07-20 14:32:14,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 14:32:14,940 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 662 [2020-07-20 14:32:14,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:14,944 INFO L225 Difference]: With dead ends: 642 [2020-07-20 14:32:14,944 INFO L226 Difference]: Without dead ends: 476 [2020-07-20 14:32:14,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1404 GetRequests, 1288 SyntacticMatches, 5 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3033 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3542, Invalid=9114, Unknown=0, NotChecked=0, Total=12656 [2020-07-20 14:32:14,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-20 14:32:15,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-20 14:32:15,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-20 14:32:15,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 607 transitions. [2020-07-20 14:32:15,041 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 607 transitions. Word has length 662 [2020-07-20 14:32:15,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:15,041 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 607 transitions. [2020-07-20 14:32:15,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 14:32:15,042 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 607 transitions. [2020-07-20 14:32:15,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-20 14:32:15,048 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:15,048 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:15,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:15,262 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:15,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:15,262 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 30 times [2020-07-20 14:32:15,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:15,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903519724] [2020-07-20 14:32:15,263 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:15,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:15,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:15,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 1185 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:32:15,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:16,098 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2050 proven. 8359 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-20 14:32:16,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:17,132 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1083 proven. 8360 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-20 14:32:17,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903519724] [2020-07-20 14:32:17,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:17,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-20 14:32:17,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958829273] [2020-07-20 14:32:17,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 14:32:17,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:17,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 14:32:17,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2020-07-20 14:32:17,134 INFO L87 Difference]: Start difference. First operand 468 states and 607 transitions. Second operand 27 states. [2020-07-20 14:32:21,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:21,864 INFO L93 Difference]: Finished difference Result 1029 states and 1363 transitions. [2020-07-20 14:32:21,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 14:32:21,866 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 669 [2020-07-20 14:32:21,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:21,871 INFO L225 Difference]: With dead ends: 1029 [2020-07-20 14:32:21,871 INFO L226 Difference]: Without dead ends: 859 [2020-07-20 14:32:21,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1414 GetRequests, 1305 SyntacticMatches, 7 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3938 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=2225, Invalid=8487, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 14:32:21,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2020-07-20 14:32:21,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 613. [2020-07-20 14:32:21,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-20 14:32:21,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 796 transitions. [2020-07-20 14:32:21,991 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 796 transitions. Word has length 669 [2020-07-20 14:32:21,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:21,992 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 796 transitions. [2020-07-20 14:32:21,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 14:32:21,992 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 796 transitions. [2020-07-20 14:32:21,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-20 14:32:21,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:21,999 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:22,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:22,213 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:22,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:22,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 31 times [2020-07-20 14:32:22,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:22,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95241778] [2020-07-20 14:32:22,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:22,360 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:32:22,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:22,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 809 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 14:32:22,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:22,918 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12374 proven. 1344 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-20 14:32:22,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:24,084 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9512 proven. 1344 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-20 14:32:24,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95241778] [2020-07-20 14:32:24,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:24,085 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-20 14:32:24,085 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811457448] [2020-07-20 14:32:24,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 14:32:24,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:24,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 14:32:24,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=418, Unknown=0, NotChecked=0, Total=552 [2020-07-20 14:32:24,086 INFO L87 Difference]: Start difference. First operand 613 states and 796 transitions. Second operand 24 states. [2020-07-20 14:32:26,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:26,256 INFO L93 Difference]: Finished difference Result 802 states and 1052 transitions. [2020-07-20 14:32:26,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-20 14:32:26,257 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 707 [2020-07-20 14:32:26,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:26,260 INFO L225 Difference]: With dead ends: 802 [2020-07-20 14:32:26,260 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 14:32:26,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1455 GetRequests, 1391 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1039, Invalid=2501, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 14:32:26,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 14:32:26,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-20 14:32:26,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-20 14:32:26,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 633 transitions. [2020-07-20 14:32:26,367 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 633 transitions. Word has length 707 [2020-07-20 14:32:26,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:26,367 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 633 transitions. [2020-07-20 14:32:26,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 14:32:26,368 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 633 transitions. [2020-07-20 14:32:26,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-20 14:32:26,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:26,375 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:26,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:26,586 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:26,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:26,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 32 times [2020-07-20 14:32:26,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:26,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6449214] [2020-07-20 14:32:26,587 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:26,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:26,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:26,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 1263 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:32:26,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:27,551 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1607 proven. 10306 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-20 14:32:27,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:28,893 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 906 proven. 10307 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-20 14:32:28,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6449214] [2020-07-20 14:32:28,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:28,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-20 14:32:28,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056099577] [2020-07-20 14:32:28,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 14:32:28,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:28,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 14:32:28,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2020-07-20 14:32:28,895 INFO L87 Difference]: Start difference. First operand 490 states and 633 transitions. Second operand 31 states. [2020-07-20 14:32:38,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:38,563 INFO L93 Difference]: Finished difference Result 785 states and 1037 transitions. [2020-07-20 14:32:38,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2020-07-20 14:32:38,564 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 714 [2020-07-20 14:32:38,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:38,567 INFO L225 Difference]: With dead ends: 785 [2020-07-20 14:32:38,568 INFO L226 Difference]: Without dead ends: 605 [2020-07-20 14:32:38,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1546 GetRequests, 1391 SyntacticMatches, 7 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8958 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=4408, Invalid=17942, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 14:32:38,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-20 14:32:38,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 514. [2020-07-20 14:32:38,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-20 14:32:38,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 665 transitions. [2020-07-20 14:32:38,657 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 665 transitions. Word has length 714 [2020-07-20 14:32:38,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:38,658 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 665 transitions. [2020-07-20 14:32:38,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 14:32:38,658 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 665 transitions. [2020-07-20 14:32:38,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-20 14:32:38,665 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:38,666 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:38,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:38,876 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:38,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:38,877 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 33 times [2020-07-20 14:32:38,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:38,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1318743469] [2020-07-20 14:32:38,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:39,031 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:32:39,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:39,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 866 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:32:39,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:39,784 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14422 proven. 1721 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-20 14:32:39,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:41,172 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9744 proven. 3285 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-20 14:32:41,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1318743469] [2020-07-20 14:32:41,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:41,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-20 14:32:41,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338846663] [2020-07-20 14:32:41,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 14:32:41,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:41,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 14:32:41,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-20 14:32:41,175 INFO L87 Difference]: Start difference. First operand 514 states and 665 transitions. Second operand 28 states. [2020-07-20 14:32:45,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:32:45,067 INFO L93 Difference]: Finished difference Result 684 states and 896 transitions. [2020-07-20 14:32:45,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-20 14:32:45,068 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 759 [2020-07-20 14:32:45,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:32:45,072 INFO L225 Difference]: With dead ends: 684 [2020-07-20 14:32:45,072 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 14:32:45,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1576 GetRequests, 1491 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1396 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1853, Invalid=4627, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 14:32:45,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 14:32:45,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-20 14:32:45,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-20 14:32:45,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 663 transitions. [2020-07-20 14:32:45,209 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 663 transitions. Word has length 759 [2020-07-20 14:32:45,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:32:45,210 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 663 transitions. [2020-07-20 14:32:45,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 14:32:45,210 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 663 transitions. [2020-07-20 14:32:45,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-20 14:32:45,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:32:45,218 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:32:45,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:45,434 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:32:45,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:32:45,434 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 34 times [2020-07-20 14:32:45,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:32:45,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975162646] [2020-07-20 14:32:45,435 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:32:45,760 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:32:45,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:32:45,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:32:45,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:32:46,790 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1077 proven. 12698 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-20 14:32:46,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:32:48,348 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 694 proven. 12699 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-20 14:32:48,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975162646] [2020-07-20 14:32:48,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:32:48,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-20 14:32:48,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251603869] [2020-07-20 14:32:48,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 14:32:48,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:32:48,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 14:32:48,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=966, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 14:32:48,351 INFO L87 Difference]: Start difference. First operand 514 states and 663 transitions. Second operand 35 states. [2020-07-20 14:33:02,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:02,131 INFO L93 Difference]: Finished difference Result 784 states and 1029 transitions. [2020-07-20 14:33:02,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2020-07-20 14:33:02,133 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 766 [2020-07-20 14:33:02,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:02,136 INFO L225 Difference]: With dead ends: 784 [2020-07-20 14:33:02,136 INFO L226 Difference]: Without dead ends: 601 [2020-07-20 14:33:02,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1671 GetRequests, 1491 SyntacticMatches, 7 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12320 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=5987, Invalid=24463, Unknown=0, NotChecked=0, Total=30450 [2020-07-20 14:33:02,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2020-07-20 14:33:02,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 541. [2020-07-20 14:33:02,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-20 14:33:02,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 699 transitions. [2020-07-20 14:33:02,240 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 699 transitions. Word has length 766 [2020-07-20 14:33:02,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:02,241 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 699 transitions. [2020-07-20 14:33:02,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 14:33:02,241 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 699 transitions. [2020-07-20 14:33:02,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-20 14:33:02,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:02,248 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:02,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:02,456 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:02,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:02,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 35 times [2020-07-20 14:33:02,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:02,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953162512] [2020-07-20 14:33:02,458 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:02,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:33:02,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:02,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 932 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:33:02,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:03,606 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16919 proven. 2161 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-20 14:33:03,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:05,472 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10149 proven. 5529 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-20 14:33:05,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953162512] [2020-07-20 14:33:05,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:05,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-20 14:33:05,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707870099] [2020-07-20 14:33:05,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 14:33:05,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:05,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 14:33:05,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=770, Unknown=0, NotChecked=0, Total=992 [2020-07-20 14:33:05,475 INFO L87 Difference]: Start difference. First operand 541 states and 699 transitions. Second operand 32 states. [2020-07-20 14:33:13,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:13,646 INFO L93 Difference]: Finished difference Result 711 states and 929 transitions. [2020-07-20 14:33:13,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-20 14:33:13,648 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 818 [2020-07-20 14:33:13,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:13,652 INFO L225 Difference]: With dead ends: 711 [2020-07-20 14:33:13,653 INFO L226 Difference]: Without dead ends: 541 [2020-07-20 14:33:13,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1712 GetRequests, 1605 SyntacticMatches, 6 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2503 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=2931, Invalid=7575, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 14:33:13,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-20 14:33:13,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-20 14:33:13,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-20 14:33:13,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 697 transitions. [2020-07-20 14:33:13,799 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 697 transitions. Word has length 818 [2020-07-20 14:33:13,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:13,800 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 697 transitions. [2020-07-20 14:33:13,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 14:33:13,800 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 697 transitions. [2020-07-20 14:33:13,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-20 14:33:13,807 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:13,808 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:14,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:14,010 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:14,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:14,010 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 36 times [2020-07-20 14:33:14,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:14,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782658309] [2020-07-20 14:33:14,011 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:14,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:14,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:14,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:33:14,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:15,541 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 439 proven. 15607 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-20 14:33:15,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:17,584 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 438 proven. 15608 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-20 14:33:17,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782658309] [2020-07-20 14:33:17,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:17,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-20 14:33:17,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587726895] [2020-07-20 14:33:17,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 14:33:17,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:17,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 14:33:17,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1211, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 14:33:17,587 INFO L87 Difference]: Start difference. First operand 541 states and 697 transitions. Second operand 39 states. [2020-07-20 14:33:38,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:38,091 INFO L93 Difference]: Finished difference Result 791 states and 1034 transitions. [2020-07-20 14:33:38,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 165 states. [2020-07-20 14:33:38,093 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 825 [2020-07-20 14:33:38,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:38,097 INFO L225 Difference]: With dead ends: 791 [2020-07-20 14:33:38,097 INFO L226 Difference]: Without dead ends: 605 [2020-07-20 14:33:38,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1807 GetRequests, 1605 SyntacticMatches, 7 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15667 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=7390, Invalid=31222, Unknown=0, NotChecked=0, Total=38612 [2020-07-20 14:33:38,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-20 14:33:38,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 571. [2020-07-20 14:33:38,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-20 14:33:38,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 737 transitions. [2020-07-20 14:33:38,210 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 737 transitions. Word has length 825 [2020-07-20 14:33:38,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:38,210 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 737 transitions. [2020-07-20 14:33:38,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 14:33:38,210 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 737 transitions. [2020-07-20 14:33:38,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-20 14:33:38,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:38,217 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:38,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:38,424 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:38,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:38,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 37 times [2020-07-20 14:33:38,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:38,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932856920] [2020-07-20 14:33:38,426 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:38,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:33:38,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:38,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 1004 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:33:38,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:39,883 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19928 proven. 2673 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-20 14:33:39,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:42,267 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10790 proven. 8085 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-20 14:33:42,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932856920] [2020-07-20 14:33:42,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:42,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-20 14:33:42,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739589919] [2020-07-20 14:33:42,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 14:33:42,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:42,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 14:33:42,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=985, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 14:33:42,270 INFO L87 Difference]: Start difference. First operand 571 states and 737 transitions. Second operand 36 states. [2020-07-20 14:33:51,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:51,089 INFO L93 Difference]: Finished difference Result 742 states and 967 transitions. [2020-07-20 14:33:51,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 14:33:51,091 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 884 [2020-07-20 14:33:51,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:51,094 INFO L225 Difference]: With dead ends: 742 [2020-07-20 14:33:51,094 INFO L226 Difference]: Without dead ends: 572 [2020-07-20 14:33:51,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1863 GetRequests, 1733 SyntacticMatches, 6 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3978 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=4351, Invalid=11399, Unknown=0, NotChecked=0, Total=15750 [2020-07-20 14:33:51,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-20 14:33:51,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-20 14:33:51,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-20 14:33:51,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 692 transitions. [2020-07-20 14:33:51,188 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 692 transitions. Word has length 884 [2020-07-20 14:33:51,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:33:51,189 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 692 transitions. [2020-07-20 14:33:51,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 14:33:51,189 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 692 transitions. [2020-07-20 14:33:51,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-20 14:33:51,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:33:51,196 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:33:51,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:51,397 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:33:51,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:33:51,398 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 38 times [2020-07-20 14:33:51,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:33:51,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60810990] [2020-07-20 14:33:51,398 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:33:51,646 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:33:51,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:33:51,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:33:51,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:33:52,443 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:33:52,445 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 14:33:52,953 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 17979 proven. 150 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-20 14:33:52,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:33:52,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 14:33:55,258 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7048 proven. 11081 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-20 14:33:55,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60810990] [2020-07-20 14:33:55,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:33:55,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-20 14:33:55,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255740787] [2020-07-20 14:33:55,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 14:33:55,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:33:55,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 14:33:55,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=854, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 14:33:55,260 INFO L87 Difference]: Start difference. First operand 540 states and 692 transitions. Second operand 36 states. [2020-07-20 14:33:59,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:33:59,908 INFO L93 Difference]: Finished difference Result 690 states and 898 transitions. [2020-07-20 14:33:59,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 14:33:59,911 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 891 [2020-07-20 14:33:59,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:33:59,917 INFO L225 Difference]: With dead ends: 690 [2020-07-20 14:33:59,917 INFO L226 Difference]: Without dead ends: 688 [2020-07-20 14:33:59,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1853 GetRequests, 1757 SyntacticMatches, 6 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2506 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=2537, Invalid=5835, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 14:33:59,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2020-07-20 14:34:00,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 610. [2020-07-20 14:34:00,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-20 14:34:00,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 794 transitions. [2020-07-20 14:34:00,023 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 794 transitions. Word has length 891 [2020-07-20 14:34:00,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:00,024 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 794 transitions. [2020-07-20 14:34:00,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 14:34:00,024 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 794 transitions. [2020-07-20 14:34:00,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-20 14:34:00,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:00,034 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:00,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:00,246 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:00,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:00,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 39 times [2020-07-20 14:34:00,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:00,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943778272] [2020-07-20 14:34:00,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:00,515 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:00,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:00,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 1641 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 14:34:00,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:02,248 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4622 proven. 19114 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-20 14:34:02,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:05,328 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2331 proven. 19115 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-20 14:34:05,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943778272] [2020-07-20 14:34:05,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:05,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-20 14:34:05,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932013298] [2020-07-20 14:34:05,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 14:34:05,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:05,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 14:34:05,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=1482, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 14:34:05,331 INFO L87 Difference]: Start difference. First operand 610 states and 794 transitions. Second operand 43 states. [2020-07-20 14:34:33,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:33,253 INFO L93 Difference]: Finished difference Result 911 states and 1218 transitions. [2020-07-20 14:34:33,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2020-07-20 14:34:33,256 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 933 [2020-07-20 14:34:33,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:33,260 INFO L225 Difference]: With dead ends: 911 [2020-07-20 14:34:33,261 INFO L226 Difference]: Without dead ends: 695 [2020-07-20 14:34:33,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2036 GetRequests, 1817 SyntacticMatches, 7 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18507 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=8934, Invalid=36648, Unknown=0, NotChecked=0, Total=45582 [2020-07-20 14:34:33,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2020-07-20 14:34:33,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 643. [2020-07-20 14:34:33,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-20 14:34:33,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 838 transitions. [2020-07-20 14:34:33,390 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 838 transitions. Word has length 933 [2020-07-20 14:34:33,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:33,391 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 838 transitions. [2020-07-20 14:34:33,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 14:34:33,392 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 838 transitions. [2020-07-20 14:34:33,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-20 14:34:33,403 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:33,404 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:33,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:33,617 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:33,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:33,618 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 40 times [2020-07-20 14:34:33,618 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:33,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496532825] [2020-07-20 14:34:33,619 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:33,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:34:33,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:33,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 1130 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:34:33,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:35,544 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28429 proven. 3266 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-20 14:34:35,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:38,706 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13923 proven. 10962 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-20 14:34:38,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496532825] [2020-07-20 14:34:38,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:38,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-20 14:34:38,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362788400] [2020-07-20 14:34:38,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 14:34:38,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:38,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 14:34:38,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1226, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 14:34:38,709 INFO L87 Difference]: Start difference. First operand 643 states and 838 transitions. Second operand 40 states. [2020-07-20 14:34:52,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:34:52,759 INFO L93 Difference]: Finished difference Result 1106 states and 1481 transitions. [2020-07-20 14:34:52,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-07-20 14:34:52,762 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 999 [2020-07-20 14:34:52,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:34:52,766 INFO L225 Difference]: With dead ends: 1106 [2020-07-20 14:34:52,766 INFO L226 Difference]: Without dead ends: 715 [2020-07-20 14:34:52,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2114 GetRequests, 1959 SyntacticMatches, 6 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5991 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=6299, Invalid=16351, Unknown=0, NotChecked=0, Total=22650 [2020-07-20 14:34:52,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-20 14:34:52,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-20 14:34:52,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-20 14:34:52,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 913 transitions. [2020-07-20 14:34:52,889 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 913 transitions. Word has length 999 [2020-07-20 14:34:52,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:34:52,890 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 913 transitions. [2020-07-20 14:34:52,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 14:34:52,890 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 913 transitions. [2020-07-20 14:34:52,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-20 14:34:52,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:34:52,898 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:34:53,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:53,099 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:34:53,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:34:53,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 41 times [2020-07-20 14:34:53,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:34:53,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449071686] [2020-07-20 14:34:53,101 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:34:53,386 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:34:53,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:34:53,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 1767 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 14:34:53,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:34:55,549 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4173 proven. 23309 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-20 14:34:55,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:34:59,124 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2164 proven. 23310 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-20 14:34:59,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449071686] [2020-07-20 14:34:59,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:34:59,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 47 [2020-07-20 14:34:59,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338678373] [2020-07-20 14:34:59,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 14:34:59,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:34:59,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 14:34:59,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=1779, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 14:34:59,126 INFO L87 Difference]: Start difference. First operand 695 states and 913 transitions. Second operand 47 states. [2020-07-20 14:35:00,777 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:35:01,130 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:35:02,473 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:35:04,033 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:35:04,221 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:35:06,661 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-20 14:35:07,690 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:35:08,267 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:35:08,640 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:35:09,584 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:35:10,010 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:35:12,694 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:35:14,847 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:35:15,185 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:35:29,419 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 14:35:31,119 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:35:33,770 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2020-07-20 14:35:35,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:35,421 INFO L93 Difference]: Finished difference Result 1178 states and 1580 transitions. [2020-07-20 14:35:35,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2020-07-20 14:35:35,425 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 1006 [2020-07-20 14:35:35,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:35,430 INFO L225 Difference]: With dead ends: 1178 [2020-07-20 14:35:35,430 INFO L226 Difference]: Without dead ends: 871 [2020-07-20 14:35:35,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2199 GetRequests, 1959 SyntacticMatches, 7 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22228 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=10926, Invalid=44064, Unknown=0, NotChecked=0, Total=54990 [2020-07-20 14:35:35,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2020-07-20 14:35:35,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 733. [2020-07-20 14:35:35,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-20 14:35:35,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 965 transitions. [2020-07-20 14:35:35,565 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 965 transitions. Word has length 1006 [2020-07-20 14:35:35,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:35,566 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 965 transitions. [2020-07-20 14:35:35,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 14:35:35,566 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 965 transitions. [2020-07-20 14:35:35,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-20 14:35:35,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:35,574 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:35,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:35,776 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:35,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:35,778 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 42 times [2020-07-20 14:35:35,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:35,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429419190] [2020-07-20 14:35:35,779 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:35,998 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:35:35,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:36,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 1223 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 14:35:36,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:35:38,157 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33195 proven. 3949 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-20 14:35:38,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:35:42,150 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15505 proven. 14169 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-20 14:35:42,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429419190] [2020-07-20 14:35:42,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:35:42,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 44 [2020-07-20 14:35:42,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530640023] [2020-07-20 14:35:42,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 14:35:42,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:35:42,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 14:35:42,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1493, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 14:35:42,153 INFO L87 Difference]: Start difference. First operand 733 states and 965 transitions. Second operand 44 states. [2020-07-20 14:35:57,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:35:57,949 INFO L93 Difference]: Finished difference Result 1089 states and 1476 transitions. [2020-07-20 14:35:57,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-20 14:35:57,952 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1082 [2020-07-20 14:35:57,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:35:57,959 INFO L225 Difference]: With dead ends: 1089 [2020-07-20 14:35:57,959 INFO L226 Difference]: Without dead ends: 804 [2020-07-20 14:35:57,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2281 GetRequests, 2121 SyntacticMatches, 6 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6334 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=6718, Invalid=17462, Unknown=0, NotChecked=0, Total=24180 [2020-07-20 14:35:57,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-20 14:35:58,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-20 14:35:58,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-20 14:35:58,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1040 transitions. [2020-07-20 14:35:58,110 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1040 transitions. Word has length 1082 [2020-07-20 14:35:58,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:35:58,111 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1040 transitions. [2020-07-20 14:35:58,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 14:35:58,111 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1040 transitions. [2020-07-20 14:35:58,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-20 14:35:58,120 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:35:58,121 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:35:58,333 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:58,334 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:35:58,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:35:58,335 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 43 times [2020-07-20 14:35:58,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:35:58,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617044480] [2020-07-20 14:35:58,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:35:58,616 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:35:58,617 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:35:58,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:35:58,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:00,112 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8101 proven. 22805 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-20 14:36:00,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:03,622 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3860 proven. 22806 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-20 14:36:03,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617044480] [2020-07-20 14:36:03,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:36:03,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2020-07-20 14:36:03,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63963836] [2020-07-20 14:36:03,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 14:36:03,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:03,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 14:36:03,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2020-07-20 14:36:03,624 INFO L87 Difference]: Start difference. First operand 785 states and 1040 transitions. Second operand 30 states. [2020-07-20 14:36:17,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:17,534 INFO L93 Difference]: Finished difference Result 1691 states and 2300 transitions. [2020-07-20 14:36:17,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-07-20 14:36:17,538 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1089 [2020-07-20 14:36:17,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:17,546 INFO L225 Difference]: With dead ends: 1691 [2020-07-20 14:36:17,546 INFO L226 Difference]: Without dead ends: 1390 [2020-07-20 14:36:17,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2275 GetRequests, 2141 SyntacticMatches, 8 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6349 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=3306, Invalid=12950, Unknown=0, NotChecked=0, Total=16256 [2020-07-20 14:36:17,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2020-07-20 14:36:17,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 984. [2020-07-20 14:36:17,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-20 14:36:17,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1300 transitions. [2020-07-20 14:36:17,763 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1300 transitions. Word has length 1089 [2020-07-20 14:36:17,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:17,763 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1300 transitions. [2020-07-20 14:36:17,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 14:36:17,764 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1300 transitions. [2020-07-20 14:36:17,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 14:36:17,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:17,773 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:17,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:17,974 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:17,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:17,975 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 44 times [2020-07-20 14:36:17,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:17,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954045028] [2020-07-20 14:36:17,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:18,195 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:36:18,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:18,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 1281 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 14:36:18,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:19,601 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34637 proven. 2618 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-20 14:36:19,602 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:23,465 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26747 proven. 2618 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-20 14:36:23,466 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954045028] [2020-07-20 14:36:23,466 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:36:23,466 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-20 14:36:23,466 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512730461] [2020-07-20 14:36:23,467 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 14:36:23,467 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:23,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 14:36:23,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=534, Unknown=0, NotChecked=0, Total=702 [2020-07-20 14:36:23,468 INFO L87 Difference]: Start difference. First operand 984 states and 1300 transitions. Second operand 27 states. [2020-07-20 14:36:29,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:36:29,638 INFO L93 Difference]: Finished difference Result 1307 states and 1759 transitions. [2020-07-20 14:36:29,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 14:36:29,643 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1134 [2020-07-20 14:36:29,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:36:29,648 INFO L225 Difference]: With dead ends: 1307 [2020-07-20 14:36:29,648 INFO L226 Difference]: Without dead ends: 810 [2020-07-20 14:36:29,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2319 GetRequests, 2242 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1055 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1491, Invalid=3621, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 14:36:29,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-20 14:36:29,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-20 14:36:29,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-20 14:36:29,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1070 transitions. [2020-07-20 14:36:29,806 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1070 transitions. Word has length 1134 [2020-07-20 14:36:29,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:36:29,807 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1070 transitions. [2020-07-20 14:36:29,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 14:36:29,807 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1070 transitions. [2020-07-20 14:36:29,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-20 14:36:29,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:36:29,816 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:36:30,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:30,017 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:36:30,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:36:30,018 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 45 times [2020-07-20 14:36:30,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:36:30,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504496622] [2020-07-20 14:36:30,019 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:36:30,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:36:30,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:36:30,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 2001 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:36:30,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:36:32,282 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7593 proven. 26378 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-20 14:36:32,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:36:36,755 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3658 proven. 26379 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-20 14:36:36,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504496622] [2020-07-20 14:36:36,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:36:36,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2020-07-20 14:36:36,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748024181] [2020-07-20 14:36:36,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 14:36:36,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:36:36,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 14:36:36,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 14:36:36,758 INFO L87 Difference]: Start difference. First operand 810 states and 1070 transitions. Second operand 34 states. [2020-07-20 14:36:38,616 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 14:36:38,848 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:36:39,060 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:36:39,280 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 14:36:40,829 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 14:36:41,070 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:36:41,293 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:36:41,508 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:36:41,750 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:36:44,700 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:36:44,970 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:36:45,226 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:45,463 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:45,701 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:45,962 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:36:49,679 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:36:49,980 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:36:50,256 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:50,530 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:36:50,790 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:36:51,045 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:51,319 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:36:58,154 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:36:58,486 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:58,798 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:36:59,101 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:36:59,392 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:36:59,673 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:36:59,945 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:37:00,234 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:37:05,594 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:37:06,322 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:37:06,655 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:37:06,973 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:37:07,280 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:37:07,589 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:37:07,892 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:37:08,178 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:37:08,426 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:37:08,985 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:37:09,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:09,796 INFO L93 Difference]: Finished difference Result 1330 states and 1815 transitions. [2020-07-20 14:37:09,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2020-07-20 14:37:09,802 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 1141 [2020-07-20 14:37:09,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:09,808 INFO L225 Difference]: With dead ends: 1330 [2020-07-20 14:37:09,808 INFO L226 Difference]: Without dead ends: 1019 [2020-07-20 14:37:09,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2435 GetRequests, 2241 SyntacticMatches, 8 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14972 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=6712, Invalid=28444, Unknown=0, NotChecked=0, Total=35156 [2020-07-20 14:37:09,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2020-07-20 14:37:09,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 837. [2020-07-20 14:37:09,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-20 14:37:09,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1106 transitions. [2020-07-20 14:37:09,991 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1106 transitions. Word has length 1141 [2020-07-20 14:37:09,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:09,992 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1106 transitions. [2020-07-20 14:37:09,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 14:37:09,992 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1106 transitions. [2020-07-20 14:37:10,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-20 14:37:10,003 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:10,003 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:10,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:10,204 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:10,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:10,206 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 46 times [2020-07-20 14:37:10,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:10,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71663053] [2020-07-20 14:37:10,207 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:10,474 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:37:10,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:10,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 1346 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 14:37:10,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:37:12,421 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38517 proven. 3198 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-20 14:37:12,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:37:17,914 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27160 proven. 6185 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-20 14:37:17,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71663053] [2020-07-20 14:37:17,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:37:17,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-20 14:37:17,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528283324] [2020-07-20 14:37:17,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 14:37:17,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:17,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 14:37:17,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2020-07-20 14:37:17,917 INFO L87 Difference]: Start difference. First operand 837 states and 1106 transitions. Second operand 31 states. [2020-07-20 14:37:31,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:37:31,002 INFO L93 Difference]: Finished difference Result 1138 states and 1536 transitions. [2020-07-20 14:37:31,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-20 14:37:31,008 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1193 [2020-07-20 14:37:31,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:37:31,013 INFO L225 Difference]: With dead ends: 1138 [2020-07-20 14:37:31,013 INFO L226 Difference]: Without dead ends: 837 [2020-07-20 14:37:31,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2457 GetRequests, 2356 SyntacticMatches, 7 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=2584, Invalid=6536, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 14:37:31,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-20 14:37:31,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-20 14:37:31,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-20 14:37:31,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1104 transitions. [2020-07-20 14:37:31,181 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1104 transitions. Word has length 1193 [2020-07-20 14:37:31,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:37:31,182 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1104 transitions. [2020-07-20 14:37:31,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 14:37:31,182 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1104 transitions. [2020-07-20 14:37:31,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-20 14:37:31,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:37:31,193 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:37:31,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:31,400 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:37:31,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:37:31,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 47 times [2020-07-20 14:37:31,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:37:31,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1319004703] [2020-07-20 14:37:31,402 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:37:31,743 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:37:31,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:37:31,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 2103 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:37:31,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:37:34,407 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7019 proven. 30608 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-20 14:37:34,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:37:40,574 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3430 proven. 30609 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-20 14:37:40,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1319004703] [2020-07-20 14:37:40,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:37:40,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 38 [2020-07-20 14:37:40,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707421051] [2020-07-20 14:37:40,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 14:37:40,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:37:40,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 14:37:40,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1141, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 14:37:40,577 INFO L87 Difference]: Start difference. First operand 837 states and 1104 transitions. Second operand 38 states. [2020-07-20 14:37:41,723 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:37:42,719 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-20 14:37:43,004 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 14:37:43,348 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:43,660 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:43,964 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 14:37:44,180 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 14:37:44,424 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:37:45,638 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 14:37:45,963 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 14:37:46,314 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:37:46,610 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:46,903 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:47,201 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:37:47,439 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-20 14:37:47,755 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-20 14:37:48,127 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:37:48,474 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 14:37:48,808 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:37:49,142 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:49,489 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 14:37:49,798 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 20 [2020-07-20 14:37:50,095 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 19 [2020-07-20 14:37:50,459 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:37:50,951 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:37:51,190 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:37:51,443 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:37:51,722 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 14:37:52,074 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:37:52,452 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:37:52,791 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:37:53,113 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:37:53,433 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:37:53,762 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:37:54,027 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-20 14:37:54,371 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:37:54,784 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:37:55,162 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:37:55,538 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:55,886 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:37:56,238 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:37:56,625 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:38:00,005 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:38:00,289 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:38:00,549 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:38:00,793 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:38:01,041 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:38:01,299 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:38:01,572 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 14:38:01,958 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:02,341 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:38:02,703 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:03,051 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:38:03,372 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:38:03,691 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:04,014 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:38:04,268 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-20 14:38:04,616 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:38:05,026 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:05,416 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:38:05,803 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:06,146 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:06,462 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:06,798 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:07,177 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:38:15,065 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:38:15,336 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:38:15,601 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:38:15,893 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-20 14:38:16,201 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 14:38:16,628 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:17,101 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:17,511 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:17,913 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:38:18,308 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:38:18,687 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:38:19,053 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:38:19,414 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:38:19,723 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-07-20 14:38:20,161 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:38:20,663 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:38:21,129 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:21,607 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:22,027 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:38:22,437 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:38:22,822 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:38:23,207 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:38:23,662 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:38:24,001 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:38:29,390 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:38:29,893 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 16 [2020-07-20 14:38:30,432 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:38:30,840 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-20 14:38:31,285 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:38:31,697 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:38:32,091 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:38:32,470 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:38:32,856 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:38:33,248 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:38:33,634 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:38:33,998 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 14:38:34,288 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 19 [2020-07-20 14:38:34,664 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 14:38:34,900 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:38:35,122 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-20 14:38:35,584 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:38:36,008 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:38:36,458 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:38:36,864 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:38:37,262 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:38:37,637 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:38:37,995 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:38:38,390 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:38:38,731 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:38:39,546 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:38:40,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:38:40,555 INFO L93 Difference]: Finished difference Result 1314 states and 1782 transitions. [2020-07-20 14:38:40,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 200 states. [2020-07-20 14:38:40,563 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 1200 [2020-07-20 14:38:40,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:38:40,570 INFO L225 Difference]: With dead ends: 1314 [2020-07-20 14:38:40,570 INFO L226 Difference]: Without dead ends: 1000 [2020-07-20 14:38:40,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2592 GetRequests, 2355 SyntacticMatches, 8 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23317 ImplicationChecksByTransitivity, 49.5s TimeCoverageRelationStatistics Valid=9982, Invalid=43148, Unknown=0, NotChecked=0, Total=53130 [2020-07-20 14:38:40,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2020-07-20 14:38:40,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 867. [2020-07-20 14:38:40,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-20 14:38:40,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1144 transitions. [2020-07-20 14:38:40,754 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1144 transitions. Word has length 1200 [2020-07-20 14:38:40,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:38:40,755 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1144 transitions. [2020-07-20 14:38:40,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 14:38:40,755 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1144 transitions. [2020-07-20 14:38:40,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-20 14:38:40,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:38:40,768 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:38:40,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:38:40,969 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:38:40,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:38:40,970 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 48 times [2020-07-20 14:38:40,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:38:40,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903114301] [2020-07-20 14:38:40,971 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:38:41,242 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:38:41,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:38:41,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 1418 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 14:38:41,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:38:44,027 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43091 proven. 3850 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-20 14:38:44,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:38:51,886 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27808 proven. 10223 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-20 14:38:51,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903114301] [2020-07-20 14:38:51,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:38:51,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-20 14:38:51,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589436978] [2020-07-20 14:38:51,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 14:38:51,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:38:51,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 14:38:51,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=926, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 14:38:51,889 INFO L87 Difference]: Start difference. First operand 867 states and 1144 transitions. Second operand 35 states. [2020-07-20 14:39:11,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:39:11,984 INFO L93 Difference]: Finished difference Result 1168 states and 1573 transitions. [2020-07-20 14:39:11,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 14:39:11,991 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1259 [2020-07-20 14:39:11,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:39:11,998 INFO L225 Difference]: With dead ends: 1168 [2020-07-20 14:39:11,998 INFO L226 Difference]: Without dead ends: 867 [2020-07-20 14:39:12,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2609 GetRequests, 2484 SyntacticMatches, 7 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3533 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=3982, Invalid=10298, Unknown=0, NotChecked=0, Total=14280 [2020-07-20 14:39:12,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-20 14:39:12,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-20 14:39:12,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-20 14:39:12,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1142 transitions. [2020-07-20 14:39:12,218 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1142 transitions. Word has length 1259 [2020-07-20 14:39:12,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:39:12,219 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1142 transitions. [2020-07-20 14:39:12,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 14:39:12,220 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1142 transitions. [2020-07-20 14:39:12,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-20 14:39:12,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:39:12,239 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:39:12,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:12,440 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:39:12,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:39:12,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 49 times [2020-07-20 14:39:12,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:39:12,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804984776] [2020-07-20 14:39:12,442 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:39:12,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:39:12,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:39:12,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 2217 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 14:39:12,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:39:16,326 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6358 proven. 35576 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-20 14:39:16,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:39:24,698 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3167 proven. 35577 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-20 14:39:24,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804984776] [2020-07-20 14:39:24,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:39:24,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 42 [2020-07-20 14:39:24,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582491529] [2020-07-20 14:39:24,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-20 14:39:24,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:39:24,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-20 14:39:24,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=1407, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 14:39:24,701 INFO L87 Difference]: Start difference. First operand 867 states and 1142 transitions. Second operand 42 states. [2020-07-20 14:39:25,371 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:25,673 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:39:26,000 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:39:26,308 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 14:39:26,720 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:27,020 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:39:27,306 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-20 14:39:27,647 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:39:28,039 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:28,490 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:28,903 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:29,315 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:39:29,685 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 17 [2020-07-20 14:39:29,994 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:39:30,447 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:39:30,756 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-07-20 14:39:31,130 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:39:31,473 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:39:31,880 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:32,340 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:32,753 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:33,158 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:33,595 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:39:33,992 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 14:39:34,453 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-20 14:39:34,989 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:35,470 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 14:39:35,920 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:39:36,366 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:36,730 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 14:39:37,060 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:39:37,435 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:39:37,882 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 14:39:38,209 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:38,497 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:38,780 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:39,079 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:39:39,612 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:39:40,072 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:39:40,490 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:40,932 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:41,339 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:39:41,823 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:39:42,234 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:39:42,739 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:39:43,296 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:39:43,804 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:44,277 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:44,743 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:45,185 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:45,645 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:39:45,979 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:39:46,450 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:39:47,024 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:47,563 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:48,075 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:48,583 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:49,084 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:49,553 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:50,064 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:39:50,474 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:39:50,898 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:39:51,415 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 14:39:51,788 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:52,109 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:39:52,427 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:39:52,729 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:39:53,084 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:39:53,467 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:39:53,938 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:54,436 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:39:54,923 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:55,382 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:39:55,801 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:56,241 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:39:56,717 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:39:57,130 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:39:57,689 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:39:58,270 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:39:58,776 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:39:59,291 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:39:59,766 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:00,240 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:40:00,687 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:01,182 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:40:01,571 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:40:02,102 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:40:02,734 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:40:03,332 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:40:03,859 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:40:04,367 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:04,868 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:40:05,317 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:05,767 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:40:06,239 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:40:06,640 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:40:12,294 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:40:12,677 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:40:13,030 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:40:13,367 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:40:13,676 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:40:13,998 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:40:14,358 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:40:14,760 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:40:15,246 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:15,799 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:16,281 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:16,777 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:40:17,233 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:40:17,695 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:18,157 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:40:18,642 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:40:19,062 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-20 14:40:19,702 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:40:20,373 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:40:20,985 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:40:21,574 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:40:22,187 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:40:22,763 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:40:23,315 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:40:23,862 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:40:24,361 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:40:24,752 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 14:40:25,331 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:40:26,004 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:40:26,691 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:40:27,359 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:40:27,928 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:28,545 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:29,091 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:40:29,611 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:40:30,121 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:40:30,667 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:40:31,093 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:40:38,313 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:40:38,740 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-20 14:40:39,120 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:40:39,498 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:40:39,868 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:40:40,228 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:40:40,593 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-20 14:40:40,965 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 14:40:41,411 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 14:40:41,986 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:40:42,636 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:40:43,217 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:40:43,762 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:40:44,323 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:40:44,862 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:40:45,371 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:40:45,875 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:40:46,420 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 14:40:46,888 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 14:40:47,559 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2020-07-20 14:40:48,264 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:40:49,021 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-20 14:40:49,681 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-07-20 14:40:50,308 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:40:50,971 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:40:51,612 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:40:52,173 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-07-20 14:40:52,737 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:40:53,264 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 24 [2020-07-20 14:40:53,682 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 14:40:54,282 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 14:40:54,612 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 14:40:54,942 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:40:55,598 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:40:56,229 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:40:56,852 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:40:57,442 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:40:58,013 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:40:58,575 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:40:59,090 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 14:40:59,638 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:41:00,188 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:41:00,654 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 14:41:01,690 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 14:41:02,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:41:02,973 INFO L93 Difference]: Finished difference Result 1301 states and 1754 transitions. [2020-07-20 14:41:02,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 223 states. [2020-07-20 14:41:02,983 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 1266 [2020-07-20 14:41:02,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:41:02,989 INFO L225 Difference]: With dead ends: 1301 [2020-07-20 14:41:02,989 INFO L226 Difference]: Without dead ends: 984 [2020-07-20 14:41:02,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2747 GetRequests, 2483 SyntacticMatches, 8 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29010 ImplicationChecksByTransitivity, 81.1s TimeCoverageRelationStatistics Valid=12036, Invalid=54270, Unknown=0, NotChecked=0, Total=66306 [2020-07-20 14:41:02,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2020-07-20 14:41:03,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 900. [2020-07-20 14:41:03,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-20 14:41:03,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1186 transitions. [2020-07-20 14:41:03,205 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1186 transitions. Word has length 1266 [2020-07-20 14:41:03,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:41:03,206 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1186 transitions. [2020-07-20 14:41:03,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-20 14:41:03,206 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1186 transitions. [2020-07-20 14:41:03,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-20 14:41:03,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:41:03,222 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:41:03,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:03,424 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:41:03,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:41:03,425 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 50 times [2020-07-20 14:41:03,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:41:03,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42082659] [2020-07-20 14:41:03,426 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:03,728 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 14:41:03,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:41:03,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 1498 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 14:41:03,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:41:07,638 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48431 proven. 4583 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-20 14:41:07,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:41:18,425 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28763 proven. 14741 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-20 14:41:18,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42082659] [2020-07-20 14:41:18,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:41:18,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-20 14:41:18,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751055913] [2020-07-20 14:41:18,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 14:41:18,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:41:18,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 14:41:18,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1161, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 14:41:18,428 INFO L87 Difference]: Start difference. First operand 900 states and 1186 transitions. Second operand 39 states. [2020-07-20 14:41:50,913 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 15 [2020-07-20 14:41:51,192 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 14:41:51,470 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-20 14:41:51,755 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-20 14:41:52,062 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 14:41:52,380 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 14:41:52,686 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 14:41:52,987 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 16 [2020-07-20 14:41:53,298 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 14:41:53,647 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 14:41:54,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 14:41:54,668 INFO L93 Difference]: Finished difference Result 1201 states and 1614 transitions. [2020-07-20 14:41:54,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2020-07-20 14:41:54,679 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1332 [2020-07-20 14:41:54,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 14:41:54,689 INFO L225 Difference]: With dead ends: 1201 [2020-07-20 14:41:54,690 INFO L226 Difference]: Without dead ends: 900 [2020-07-20 14:41:54,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2776 GetRequests, 2626 SyntacticMatches, 7 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5475 ImplicationChecksByTransitivity, 28.9s TimeCoverageRelationStatistics Valid=5748, Invalid=15132, Unknown=0, NotChecked=0, Total=20880 [2020-07-20 14:41:54,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-20 14:41:54,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-20 14:41:54,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-20 14:41:54,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1184 transitions. [2020-07-20 14:41:54,897 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1184 transitions. Word has length 1332 [2020-07-20 14:41:54,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 14:41:54,898 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1184 transitions. [2020-07-20 14:41:54,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 14:41:54,899 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1184 transitions. [2020-07-20 14:41:54,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-20 14:41:54,914 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 14:41:54,915 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 14:41:55,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:55,116 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 14:41:55,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 14:41:55,118 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 51 times [2020-07-20 14:41:55,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 14:41:55,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251085545] [2020-07-20 14:41:55,119 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 14:41:55,543 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:41:55,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 14:41:55,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 14:41:55,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 14:42:00,550 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5589 proven. 41372 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-20 14:42:00,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 14:42:12,223 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2860 proven. 41373 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-20 14:42:12,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251085545] [2020-07-20 14:42:12,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 14:42:12,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2020-07-20 14:42:12,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359967933] [2020-07-20 14:42:12,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-20 14:42:12,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 14:42:12,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-20 14:42:12,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 14:42:12,228 INFO L87 Difference]: Start difference. First operand 900 states and 1184 transitions. Second operand 46 states. [2020-07-20 14:42:13,119 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:13,462 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:42:13,816 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 14:42:14,224 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:42:14,747 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 14:42:15,079 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:15,348 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 16 [2020-07-20 14:42:15,717 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:42:16,195 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:16,726 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:17,158 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:17,557 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:42:17,902 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:42:18,278 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 14:42:18,776 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:19,114 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:19,391 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:19,689 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:42:20,057 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:42:20,561 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:42:21,122 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:21,598 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:22,045 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:22,514 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:42:22,876 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:42:23,378 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:42:23,973 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:42:24,522 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:42:25,043 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:42:25,541 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:26,077 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 14:42:26,510 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:42:26,948 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:42:27,522 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 14:42:27,927 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:28,284 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 14:42:28,616 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:28,993 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:42:29,694 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:42:30,300 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:42:30,783 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:31,261 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:31,714 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:32,200 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:42:32,603 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:42:33,151 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:33,812 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:42:34,411 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:42:34,962 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:42:35,534 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:36,058 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:36,634 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:42:37,133 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 14:42:37,748 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 14:42:38,444 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:39,109 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:42:39,755 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 14:42:40,338 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:42:40,950 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:41,548 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:42,096 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 14:42:42,566 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 14:42:43,089 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:42:43,724 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:42:44,177 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:42:44,577 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:42:44,967 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:42:45,362 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:42:45,774 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:42:46,198 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-20 14:42:46,704 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:47,283 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:42:47,808 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:48,292 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:48,752 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:49,212 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 14:42:49,645 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-20 14:42:50,256 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:50,868 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:51,486 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:42:52,071 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:52,668 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:53,251 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:42:53,802 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:42:54,401 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:42:54,923 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-20 14:42:55,613 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:42:56,358 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:42:57,033 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:57,737 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:42:58,386 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:59,010 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:42:59,635 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:00,231 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:00,799 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:01,239 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 14:43:01,870 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:43:02,645 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:43:03,414 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:04,139 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:04,803 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:05,487 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:06,167 WARN L193 SmtUtils]: Spent 294.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:06,787 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:07,382 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:08,043 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:08,577 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:43:09,122 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:43:09,755 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 14:43:10,213 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:43:10,625 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:43:11,032 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:43:11,439 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 14:43:11,798 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:43:12,235 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 14:43:12,693 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-20 14:43:13,363 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:14,066 WARN L193 SmtUtils]: Spent 311.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:14,649 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:15,195 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:43:15,736 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 14:43:16,280 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:16,779 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 14:43:17,224 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-20 14:43:17,625 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 14:43:18,242 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:18,965 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:19,614 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:20,222 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:20,840 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:21,426 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:22,034 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:22,583 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:23,213 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 14:43:23,779 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-20 14:43:24,469 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:43:25,239 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:43:25,992 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:26,734 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:27,434 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:28,127 WARN L193 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:28,826 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:29,476 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:30,084 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:30,655 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:31,092 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 14:43:31,815 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 14:43:32,671 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 14:43:33,484 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:34,312 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:35,067 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 14:43:35,798 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:36,533 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 14:43:37,220 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:37,857 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:38,476 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 14:43:39,153 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 14:43:39,706 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 14:43:40,374 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 14:43:41,086 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:41,796 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:43,146 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:43,804 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:44,514 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 14:43:45,194 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:45,849 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:46,519 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 14:43:47,157 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 14:43:47,712 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 16 [2020-07-20 14:43:48,708 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:43:49,139 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:43:49,536 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:43:49,919 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:43:50,290 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:43:50,637 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 14:43:50,975 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 14:43:51,343 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 14:43:51,741 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 14:43:52,379 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:43:53,053 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:43:53,705 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:43:54,332 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:43:54,958 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 14:43:55,571 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 14:43:56,139 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:43:56,680 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 14:43:57,218 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2020-07-20 14:43:57,649 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 14:43:58,312 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:43:59,076 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:43:59,759 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:44:00,423 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:44:01,101 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:44:01,775 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:44:02,385 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:44:02,953 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:44:03,531 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:44:04,115 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 14:44:04,613 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 14:44:05,348 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-20 14:44:06,235 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:44:07,042 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:44:07,809 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 14:44:08,591 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:44:09,385 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:44:10,122 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 14:44:10,808 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 14:44:11,465 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:44:12,101 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 14:44:12,692 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25